Titration

Question 1

define Titration

Answer 1

titration is an accurate technique that can be used to find out how much of an acid is needed to neutralise an alkali

Question 2

what happens when a neutralisation takes place

Answer 2

when neutralisation takes place, the hydrogen ions from the acid join with the hydroxide ions from the alkali to form water

H+ + OH- = H2O

Question 3

what kind of indicator should you use with a strong acid and strong alkali

Answer 3

you could use methyl orange or phenolphthalein

Question 4

types of strong acids

Answer 4

hydrochloric acid

nitric acid

sulfuric acid

Question 5

types of strong Alkalis

Answer 5

Aqueous sodium hydroxide and aqueous potassium hydroxide are strong alkalis

Question 6

titration required practical steps

Answer 6

Wash and rinse a pipette with the alkali being used

use the pipette to measure out a known and accurate volume of the alkali

place the alkali in a clean, dry conical flask

add a methyl orange or phenolphthalein

place the flak on a white tile so the colour can be cleary seen

place the acid in a burette that has been carefully washed and rinsed with the acid

take a reading of the volume of acid in the burette

carefully add the acid to the alkali, swirling the flask to thoroughly mix

continue until the indicator just changes colour. this is called the end point

take a reading of the volm of acid in the burette

calculate the volume of acid added (substract the initial reading from the final reading)

Question 7

Hazards and risks of titration

Answer 7

Acids and alkalis can damage the skin or eyes, so eye protection must be worn and any spillages wiped

Question 8

what is required to find the concentration of an acid or alkali

Answer 8

the relative volumes of acid and alkalis used

the concentration of the other acid or alkali